Annual report pursuant to Section 13 and 15(d)

Borrowings (Schedule of Borrowings) (Details)

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Borrowings (Schedule of Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Principal components:    
Total principal outstanding $ 625,000 $ 400,000
Premium on 6.125% Senior Notes, net of accumulated amortization 7,594 0
Unamortized deferred financing costs (12,398) (9,781)
Total carrying value of borrowings 620,196 390,219
Senior Secured Revolving Credit Facility    
Principal components:    
Total principal outstanding 25,000 0
6.125% senior unsecured notes due 2024    
Principal components:    
Total principal outstanding $ 600,000 $ 400,000